/**
 * @param {number[]} stones
 * @param {number} k
 * @return {number}
 */
 var mergeStones = function(stones, k) {
  let cost = 0
  for (let i = 0; i < stones.length; i++) {
    for (let j = 0; j < k; j++) {
         
    }
    
  }
};